Swollen Mosquito Bite

Cynthia
I got bit by a mosquito (I believe) in Canada Sunday and it blew up like a balloon Monday. I called a midwife on the road back to NY and she told me to take a Benadryl. Honestly it did nothing. I woke up this morning and it's still swollen. I called my doctors office now and I'm waiting on a midwife to call back. Should I be worried? Will this go away?